Dr. Rhonda gave a presentation at a conference. She asked the audience whether they had seen movies A, B, and C, and gathered the following numbers: 223 people had seen A, 219 had seen B, 229 had seen C, 114 had seen A and B, 121 had seen A and C, 116 had seen B and C, 54 had seen all three, and 21 had seen none of the three. How many people attended her presentation? A

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